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Now showing items 11-20 of 26
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
The Mg II h&k lines are the prime chromospheric diagnostics of NASA's Interface Region Imaging Spectrograph (IRIS). In the previous papers of this series, we used a realistic three-dimensional radiative magnetohydrodynamics ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
Spicules have been observed on the Sun for more than a century, typically in chromospheric lines such as Hα and Ca II H. Recent work has shown that so-called "type II" spicules may have a role in providing mass to the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
Observations of transition region emission lines reveal the presence of redshifts in lines formed from the top of the chromosphere up to temperatures of about 2.5 × 105 K and blueshifts for temperatures above that. However, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
NASA's Interface Region Imaging Spectrograph (IRIS) small explorer mission will study how the solar atmosphere is energized. IRIS contains an imaging spectrograph that covers the Mg II h&k lines as well as a slit-jaw imager ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
We study the cosmological evolution for a universe in the presence of a continuous tower of massive scalar fields which can drive the current phase of accelerated expansion of the universe and, in addition, can contribute ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
The heating of the Sun's chromosphere remains poorly understood. While progress has been made on understanding what drives the quiet-Sun internetwork chromosphere, chromospheric heating in strong magnetic field regions ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
We report the discovery of a unique gravitational lens system, SDSS J2222+2745, producing five spectroscopically confirmed images of a zs = 2.82 quasar lensed by a foreground galaxy cluster at zl = 0.49. We also present ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
Scalar fields are crucial components in high energy physics and extensions of general relativity. The fact that they are not observed in the Solar System may be due to a mechanism which screens their presence in high dense ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
We present new high-resolution spectro-polarimetric Ca iiλ8542 observations of umbral flashes in sunspots. At nearly , and spanning about one hour of continuous observation, this is the most detailed dataset published thus ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
It is shown that a disformally coupled theory in which the gravitational sector has the Einstein-Hilbert form is equivalent to a quartic Dirac-Born-Infeld Galileon Lagrangian, possessing nonlinear higher derivative ...